{"id":967,"date":"2021-09-20T18:00:12","date_gmt":"2021-09-20T16:00:12","guid":{"rendered":"https:\/\/www.pealfa.duckdns.org\/wordpress\/?p=967"},"modified":"2022-09-18T13:20:54","modified_gmt":"2022-09-18T11:20:54","slug":"asintota-oblicua-de-una-funcion-radical","status":"publish","type":"post","link":"https:\/\/www.pealfa.duckdns.org\/wordpress\/?p=967","title":{"rendered":"As\u00edntota oblicua de una funci\u00f3n radical"},"content":{"rendered":"<p>Os propongo hoy que resolvamos un ejercicio propuesto en clase y que ha aparecido en Pruebas de Selectividad:<\/p>\n<fieldset style=\"border: 1px solid #8A0808;\">\nSea la funci\u00f3n \\(f: \\left[1\\,,+\\infty\\right) \\rightarrow \\mathbb{R}\\) definida por<br \/>\n\\[f\\left(x\\right)=\\sqrt{x^2 -x} +x \\]<br \/>\nObt\u00e9n la as\u00edntota de su gr\u00e1fica.<br \/>\n<\/fieldset>\n<p>Repasaremos algunas cuestiones elementales sobre c\u00e1lculo de l\u00edmites y obtenci\u00f3n de las as\u00edntotas de una gr\u00e1fica.<\/p>\n<p><a name='more'><\/a><\/p>\n<p>Observemos que nos dice \u00abla as\u00edntota\u00bb, dando a entender que s\u00f3lo tiene una.<\/p>\n<p>La funci\u00f3n no tiene saltos infinitos, al ser continua en todo su dominio y, por ello, no tiene as\u00edntotas verticales.<\/p>\n<p>Comprobemos si hay horizontales viendo si el es finito el l\u00edmite para \\(x\\to+\\infty\\):<br \/>\n\\[\\lim_{x \\to +\\infty} \\left( \\sqrt{x^2 -x} +x \\right) = +\\infty + \\infty = +\\infty \\]<br \/>\nConcluimos que no las tiene. Por ello, si hay as\u00edntota tendr\u00e1 que ser una oblicua \\(y=mx+n\\):<br \/>\n\\[ m=\\lim_{x \\to +\\infty} \\frac{ \\sqrt{x^2 -x} + x }{x} = \\lim_{x \\to +\\infty} \\left( \\frac{\\sqrt{x^2-x}}{x}+\\frac{x}{x}\\right)= \\lim_{x \\to +\\infty} \\left( \\sqrt{\\frac{x^2-x}{x^2}}+1\\right) =1+1=2 \\]<br \/>\n\\[\\begin{align*} n&#038;= \\lim_{x \\to +\\infty} \\left( f\\left( x \\right) &#8211; m x \\right) = \\lim_{x \\to +\\infty} \\left( \\sqrt{x^2 -x} &#8211; x \\right) = \\lim_{x \\to +\\infty}\\frac{\\left(\\sqrt{x^2 -x} &#8211; x\\right)\\left(\\sqrt{x^2 -x} + x\\right)}{ \\left(\\sqrt{x^2 -x} + x\\right) }\\\\ {}&#038;= \\lim_{x \\to +\\infty}\\frac{-x}{\\sqrt{x^2 -x} + x } = \\frac{-1}{1+1}=-\\frac{1}{2} \\end{align*} \\]<br \/>\nConcluimos que hay una as\u00edntota oblicua:<br \/>\n\\[y=2x-\\dfrac{1}{2}\\]<\/p>\n<p>Veamos c\u00f3mo puede GEOGEBRA ayudarnos. Observemos la as\u00edntota oblicua para la porci\u00f3n de gr\u00e1fica correspondiente al dominio \\( \\left[1\\,+\\infty \\right) \\):\n<\/p>\n<div style=\"text-align: center;\"><iframe loading=\"lazy\" scrolling=\"no\" src=\"https:\/\/www.geogebra.org\/material\/iframe\/id\/ugt7fgJm\/width\/777\/height\/448\/border\/888888\/sri\/true\/sdz\/true\" width=\"777px\" height=\"500px\" style=\"border:0px;\"> <\/iframe><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Os propongo hoy que resolvamos un ejercicio propuesto en clase y que ha aparecido en Pruebas de Selectividad: Sea la funci\u00f3n \\(f: [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"post-templates\/post_nosidebar.php","format":"standard","meta":{"footnotes":""},"categories":[19],"tags":[38,41,52,50],"class_list":["post-967","post","type-post","status-publish","format-standard","hentry","category-matematicas-ii","tag-analisis","tag-geogebra","tag-limites-y-continuidad","tag-video"],"_links":{"self":[{"href":"https:\/\/www.pealfa.duckdns.org\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/967","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.pealfa.duckdns.org\/wordpress\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.pealfa.duckdns.org\/wordpress\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.pealfa.duckdns.org\/wordpress\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.pealfa.duckdns.org\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=967"}],"version-history":[{"count":1,"href":"https:\/\/www.pealfa.duckdns.org\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/967\/revisions"}],"predecessor-version":[{"id":968,"href":"https:\/\/www.pealfa.duckdns.org\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/967\/revisions\/968"}],"wp:attachment":[{"href":"https:\/\/www.pealfa.duckdns.org\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=967"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.pealfa.duckdns.org\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=967"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.pealfa.duckdns.org\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=967"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}